Merge pull request #20924 from alexgiving:atrutnev/fix_gkernel_documentation

modules/gapi/include/opencv2/gapi/gkernel.hpp

@@ -719,7 +719,7 @@ namespace gapi {
      * @{
      */
     /**
-     * @brief cv::use_only() is a special combinator which hints G-API to use only
+     * @brief cv::gapi::use_only() is a special combinator which hints G-API to use only
      * kernels specified in cv::GComputation::compile() (and not to extend kernels available by
      * default with that package).
      */